Offset mechanism for saw-mill carriages



2 Sheets- Sheet 1..l

(Nb Modem Patented Deo.4, 1888.

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8. R-o-SENBBRG. OFFSET MEGHANISM FOR SAW MILL GARRIAG-:`.S. No. 888.987.Pax-.8111.88 Dec. 4, 1888..

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'UNITED STATES PATENT FEICE.

GEORGE ROSENBERG, OF MUSKEGON, MICHIGAN.

OFFSET MECHANISMFOR SAW-MILL CARRIAGES.

SECIFICATON forming part of Letters Patent No. 393,927, dated December4, 18.88. h Application filed July 6, 1888. Serial No. 279,179. (Nomodel.) i

To ail whom t may concern:

Be it known that I, GEORGE ROSENBERG, of

' Muskegon, in the county of Muskegon and State of Michigan,have'invented a new and useful Improvement in OffsetMechanism forSaw-Mill Carriages, of which vthe following is a full, clear, and exactdescription. i

My invention relates to an improvement in saw-mill carriages, and hasfor its object to provide a means whereby the log-frame and themechanism carried thereby may be shifted bodily in a line at rightangles to the line of travel by the carriage lpreparatory to giggingback; and the further 0b j ect of the invention is to provide a simple,durable, and conveniently/unanipulated device to accomplish theaforesaid end, and also to provide a device which may be readilyattached to any ordinary saw-mill carriage.

The invention consists in the construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of Areference indicatecorrespomlingl parts in all the views.

Figure 1 is a plan view of a saw-mill carriage having my improvementapplied, the said carriage being partially broken away to disclose thetrack. Fig. 2 is a transverse section taken partially on the line .cc.fr of Fig. 1, and Fig. 3, is a side elevation of a portion of therock-shaft and an end view 'of the same.

In carrying out the invention timbers 10, constituting thecarriage-frame, are bolted or secured together in any suitable orapproved manner, the said frame, being adapted to receive and supportthe ordinary head-blocks and the usual movable knees, 11. The carriageand its appurtenances are supported upon axles 12, which axles may betwo or more in number, as desired, the said axles being journaled inhangers 13, secured to the under 'face of the longitudinal timbers ofthe carriage, as best shown in Fig. 2. The said hangers are preferablyU-shaped in crosssection, and the wheels 14 are secured upon the axlesintermediate of the members of the hangers. The wheels 14 are adapted totravel upon the tracks 15.

Upon the axles 12, at each side of the center, collars 1G are keyed orotherwise fastened, and adjacent to the inner member of. the hangers 13,suspended from the longitudinal side of the frame farthest from the saw,a third collar, 1S, is rigidly fixed to the axles.

Each pair of axles 12 is connected by a cross-bar, 19, the ends of whichbars are adapted to encircle the said axles between the collars 16, asbest shown in Fig. 1. Upon the side of the longitudinal beam of thecarriage farthest from the saw a rock-shaft, 20, is journaled in boxes21, parallel with the said longitudinal beam, two or more of which boxesmay be employed. An eccentric or short crank, 22, is formed on each endof the rockshaft 20, the said eccentric faces bein g turned down whenthe carriage is carried back for a out.

A lever, 23, is secured to the rock-shaft 2O at or near its center, bymeans of which lever the said rock-shaft is manipulated. A short rod,24, is passed centrally and transversely through the cross-bars 19,provided at each side of the said cross-bars with a lock-nut or othersuitable retaining device, and having a slot produced longitudinally inthe end facing the rock-shaft. The rock-shaft and the short fixed bar24`are united by a link or connecting-rod, 25, the inner end of whichrod is pivoted in the slotted end of the short fixed rod 24, the outerend lbeing' provided with an integral sleeve, 26, in which the eccentricsurface of the rock-shaft is heldto revolve.

In operation, when the carriage is to be gigged back, the lever 23 ismoved from the saw 17, whereby the rotation of the rock-shaft 20,through the pivoted connecting-rod 25 and the eccentrics upon saidshaft, causes a tension to be exerted upon the cross-bars which are heldbetween the central collars on the axles, so that through the medium ofthe wheels the entire frame 10 and all its appurtenances are drawn awayfrom the saw, the hangers 13 sliding upon the axles. rlhe log 27 t0 becut is thus freed from the saw and the carriage may be moved in anydesired direction. Then it is desirous to throw the log into contactwith the saw, the lever 23 is carried in the direction of the same,whereupon u the frame 10 slides upon the axles in direc- IOC tion ot thesaw, the forward movement being limited b y the collar 1S, as bestillustrated in Fig. uniform forward throw of the carriage,whereby auniform cnt is made in the log.

It will be observed that the jointed or pivoted connection between therock-shaft and the cross-bars ot' the axles is necessary in order thatthe side motion ot the eccentric faces of the rock-shaft will raise andlower the rods connecting said shat't and cross-bars.

I desire it understood that the short crank or eccentric may beotherwise located upon the shaft 20, and also that there may be as manycross-bars 1.() employed as the construction of the carriage may demand.

The rock-shaft 2() may, it' desired, be journaled inside thecarriage-traine, either above or below the axle.

Havingthus described my invention, what I claim as new, and desire tosecure by VLetters Patent, is-

l. In a saw-mill carriage, the combination, with the frame provided withhangers at- The collar 1S insures at all times a 2. The combination,with the frame, hangers secured to the under face of the frame, axlesloosely mounted in said hangers, and

collars secured upon the axles at cach side of their center, of arock-shaft having an eccentric face at its extremities, a cross-baruniting each pair ot axles and retained in position by said collars, andconnecting-rods pivoted to said cross-bars and engaging the eccentricfaces of the rock-shaft, all combined to operlars attached to the axlesat each side of their center, and a stop-collar also attached to saidaxles adjacent to the inner faces ot' the inner hangers, ot' alongitudinal rock-shaft having an eccentric face at each extremity, alever secured to said rock-shaft, cross-bars uniting the said axles andretained in position by the central collars, and connecting-rods pivotedtached to its under side, and axles loosely jonrnaled in said hangers,of a longitudinal pivoted connecting-rods uniting` the said crossbarsand rock-shaft, substantially as shown and described.

to said cross-bars and engaging the eccentric faces of the rock-shaft,substantially as shown and described, whereby the body of the earriagemay be laterally reciprocated u-pon the axles to or from the saw, as setforth.

GEORGE ROSENBERG. 'itn esses:

J AMES OHARA, FLORENCE PALMER.

